Im not sure if you asked me or not but 1,187V vcore is too low as far as I know. What I've done to get my oc stable is.
Reset the bios to default.
Turned off the onboard gpu and sound (I have a soundcard)
Set my cpu ratio to 4.5 and set the voltage to 1.335
Set Load line calbration (LLC) to normal
Logged in to win started aida 64 and opened up the sensor bit
Started realbech benchmark and watched the realtime vcore drop. I went dont to 1.24 or something. The test wasnt successful. I changed LLC to High and started over
Not the drop was just fine and the benchmark finished. I did couple additional stresstest to make sure it is stable.
If the temps are too high decrease the vcore
If the system not stable increase th vcore.
Use LLC to encounter the vdrop
If you happy with the temp you can increase the mhz but you need to increase the vcore as well to stay on stable.
I'm on 1.332 with drop @ 45 in game max 70C and very quiet with the H110iGTX (with noctua industrial 2000)
If I would raise to 46 or 47 then I should have raise the Vcore but I don't want to go over 70C to be honest. I could raise the speed of the fans but it would be too "loud" for me. So that is the sweet spot. Not too hot not too loud and healthy for my CPU Edited by TheXes - 2/10/16 at 9:23am